Allow pytest 8 #1240

Job	Run time
check_links	1m 13s
check_release	1m 30s
Build, test and code coverage (ubuntu-latest, 3.8)	2m 4s
Make SDist	23s
Build, test and code coverage (ubuntu-latest, 3.11)	2m 3s
Test Docs	3m 5s
Test Lint	46s
Build, test and code coverage (macos-latest, 3.8)	4m 7s
Build, test and code coverage (macos-latest, 3.11)	4m 17s
Build, test and code coverage (windows-latest, 3.8)	3m 54s
Test Minimum Versions	40s
Test Prereleases	1m 55s
Build, test and code coverage (windows-latest, 3.11)	3m 53s
Build, test and code coverage (windows-latest, 3.9)	3m 47s
Build, test and code coverage (ubuntu-latest, pypy-3.8)	6m 55s
Build, test and code coverage (ubuntu-latest, 3.12)	2m 45s
Build, test and code coverage (macos-latest, 3.10)	4m 7s
Install from SDist and Test	1m 51s
coverage	6s
tests_check	4s
	49m 25s

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